fix(api): filter empty values when using sum and average, added min and max

packages/constants/index.ts

@@ -102,6 +102,18 @@ export const chartTypes = {
   conversion: 'Conversion',
 } as const;
 
+export const chartSegments = {
+  event: 'All events',
+  user: 'Unique users',
+  session: 'Unique sessions',
+  user_average: 'Average users',
+  one_event_per_user: 'One event per user',
+  property_sum: 'Sum of property',
+  property_average: 'Average of property',
+  property_max: 'Max of property',
+  property_min: 'Min of property',
+};
+
 export const lineTypes = {
   monotone: 'Monotone',
   monotoneX: 'Monotone X',